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Electronic DOG Chaser Repeller
The electronic dog repeller circuit produces a discomforting but not harmful, high frequency sound, audible to dogs but not to humans. Help stop the approach of unwanted dogs at up to 15 feet.
It uses 555 circuit at is easy to build, this is a dog chaser schematic that you can do it yourself
This Ultrasonic Sensor Circuit consists of a set of ultrasonic receiver and transmitter which operate at the same frequency. When something moves in the area covered the circuit’s fine balance is disturbed and the alarm is triggered. The ultrasonic circuit is very sensitive and can be adjusted to reset itself automatically or to stay triggered till it is reset manually after an alarm.
This multitone electronic siren is useful for burglar alarms, reverse horns, etc. It produces five different audio tones and is much more earcatching than a single-tone siren.
The circuit is built around popular CMOS oscillator-cum-divider IC 4060 and small audio amplifier LM386. IC 4060 is used as the multitone generator. A 100μH inductor is used at the input of IC 4060. So it oscillates within the range of about 5MHz RF.
There are many ultrasonic pest repellers available on the market but a major drawback is that their power output is low and their effectiveness suffers. The electronic pest repeller generates powerful ultrasonic signals to repel pests.
